• Title/Summary/Keyword: color mixing

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(Development of 100[W] Border Light using Color Mixing Technique by Simple-Inverse Matching Method) (Simple-Inverse Matching 혼색기법을 이용한 100[W] 무대조명 개발)

  • Youn, Jin-Sik;Song, Sang-Bin;Lim, Young-Cheol;Park, Joung-Wook;Hong, Jin-Pyo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.12
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    • pp.38-46
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    • 2010
  • For the development of 100[W] stage lighting, quantitative and uniform color mixing that applied through color adopted Simple-Inverse matching so that color mixing can be possible along Black Body Locus. R,G,B(Red, Green, Blue) LED(Light Emitting Diode) arrangement through LED package character analysis, LED module, and the characteristic of device were considered for uniform color mixing. A distance changeable optical device was built to assure high uniformity and high diffusion of not only the middle of diffusion side but also the border side. Also, we developed the control power circuit that can expand up to 6 channels which are possible for quantitative color mixing, and the high uniformity and high quantified border light for color mixing control and the verification of color mixing characteristics by composing GUI(Graphical user interface) including color mixing simulator. By presenting the experimental results of light color control, we proved the usefulness of our developed border light and the proposed color mixing method.

Color Changes in Clarified Fruit and Vegetable Juices by Mixing Ratios

  • Lee, Jun-Ho;Park, Yong-Hee
    • Preventive Nutrition and Food Science
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    • v.5 no.4
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    • pp.197-199
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    • 2000
  • Clarified fruit and vegetable juices (apple, carrot and tangerine) were produced using ultrafiltration and their color change due to the mixing ratio were evaluated. clarification was carried out by passing he supernatant of extracted juice through a filter and also by using a membrane of molecular weight cut-off 10,000 Daltons to obtain the juice ultrafiltrates. The mixing ratio between apple and carrot juices was kept constant at 1:1 while increasing the amount of tangerine juice according to 10, 20, 30, 40 and 50% an stored at 4$^{\circ}C$ prior to the color measurement. Hue angle ({TEX}$h_{ab}${/TEX}) and {TEX}$L^{*}${/TEX}-value increased as the tangerine mixing ratio increased. The color difference indicated by ΔE-value also increased as the amount of tangerine increased indicating that the color of the mixed juice became pale and the changes were slight but distinctive. On the other hand, chroma ({TEX}$C^{*}${/TEX}), {TEX}$La{*}${/TEX}- and {TEX}$b^{*}${/TEX}-values decreased as the tangerine mixing ratio increased indicating that the color of the mixed juice became slightly more grayish and the samples were becoming les yellow. A simple mathematical model to predict each color characteristic is proposed.

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Design and Simulation of White Color Mixing Lens for Backlight Unit

  • Hwang, Sung-Kyung;Lim, Mee-Hyun;Han, Hae-Wook;Cho, Min-Su;Lee, Jae-Ho;Jang, Kyeng-Kun;Kang, Sin-Ho;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.229-230
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    • 2009
  • This paper proposes a new design of ultra-slim color mixing lens (CML) for backlight unit (BLU), and presents simulated performance of the design. The novel color mixing structure has a shorter mixing length (< 1cm) than the existing color mixing structure, and achieves high efficiency and uniformity.

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Visual Color Mixing Effect of Yarns in Textile Fabrics (직물을 구성하는 실의 시각적 혼색 효과)

  • Chae, Youngjoo
    • Journal of the Korean Society of Clothing and Textiles
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    • v.43 no.3
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    • pp.373-383
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    • 2019
  • This research investigated the effect of individual yarn colors on the perception of overall colors of yarn-dyed woven fabrics. The way the colors of yarn-dyed woven fabrics are perceived is known as visual color mixing: when the different colored yarns juxtaposed on the fabric surface are observed from some distance away, they are visually mixed in our eyes and perceived as a solid color. However, we can still see individual yarn colors that make the fabrics look obviously different from actual solid colors. To quantify this visual color mixing effect, twenty-one sateen fabrics were produced in a wide range of colors using cyan, magenta, and yellow yarns, and the colors were measured instrumentally. The obtained colorimetric values were converted into solid color images on a CRT monitor. Then, the physical fabrics were scanned, and the scanned images were displayed on the monitor with solid color images in pairs for visual color difference evaluation. The woven and solid colors in each pair were of physically identical color; however, the visual color difference was as large as $4.81{\Delta}{E^*}_{ab}$ on average. A visual color difference model was proposed by considering this parametric effect of individual yarn colors.

Color Prediction of Yarn-dyed Woven Fabrics -Model Evaluation-

  • Chae, Youngjoo;Xin, John;Hua, Tao
    • Journal of the Korean Society of Clothing and Textiles
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    • v.38 no.3
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    • pp.347-354
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    • 2014
  • The color appearance of a yarn-dyed woven fabric depends on the color of the yarn as well as on the weave structure. Predicting the final color appearance or formulating the recipe is a difficult task, considering the interference of colored yarns and structure variations. In a modern fabric design process, the intended color appearance is attained through a digital color methodology based on numerous color data and color mixing recipes (i.e., color prediction models, accumulated in CAD systems). For successful color reproduction, accurate color prediction models should be devised and equipped for the systems. In this study, the final colors of yarn-dyed woven fabrics were predicted using six geometric-color mixing models (i.e., simple K/S model, log K/S model, D-G model, S-N model, modified S-N model, and W-O model). The color differences between the measured and the predicted colors were calculated to evaluate the accuracy of various color models used for different weave structures. The log K/S model, D-G model, and W-O model were found to be more accurate in color prediction of the woven fabrics used. Among these three models, the W-O model was found to be the best one as it gave the least color difference between the measured and the predicted colors.

Improvement of color mixing in an RGB lamp using tilted lenses (경사 렌즈를 사용한 RGB LED 전구 색혼합 향상)

  • Kang, Seok-Hoon;Song, Sang-Bin;Yeo, In-Seon
    • Proceedings of the KIEE Conference
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    • 2003.10a
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    • pp.145-147
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    • 2003
  • This paper presents a method of improvement of color mixing in an RGB LED white lamp. The deviation from white light after RGB color mixing results mainly from the difference in the ray direction among LEDs. The authors propose a method using tilted lenses covered over each LED to deflect the overall direction of the ray generated from far-sited LEDs toward the center axis of the lamp. The degree of improvement is evaluated using a color discrimination method based on McAdam ellipse.

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Improvement of color mixing in an RGB lamp using tilled lenses (경사렌즈를 사용한 RGB LED전구 색혼합 향상)

  • 강석훈;임성무;송상빈;여인선
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.2
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    • pp.8-15
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    • 2004
  • This paper presents a method of improvement of color mixing in an RGB LED white lamp. The deviation from white light after RGB color mixing results mainly from the difference in the ray direction among LEDs. The authors propose a method using tilted lenses covered over each LED to deflect the overall direction of the ray generated from far-sited LEDs toward the center axis of the lamp. The degree of improvement is evaulated using a color discrimination method based on McAdam ellipse.

Optical Design of Light Guide Plate Material for Slim Liquid Crystal Display (박형 디스플레이를 위한 도광판의 광학설계)

  • Gong, Taewon;Choi, Gyu Jin;Kwon, Jin Hyuk;Park, In Shik;Lee, Sunmook;Woo, DongJin;Gwag, Jin Seog
    • Journal of the Korean institute of surface engineering
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    • v.47 no.5
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    • pp.233-238
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    • 2014
  • In this paper, in order to achieve slim and light liquid crystal display, we examine the optical conditions that can obtain uniform light with higher optical efficiency over whole light guide plate (LGP) through simulation. Furthermore, to overcome the issues of hot spot in front of red, green, and blue light emitting diodes (RGB LEDs) source and non-uniform color mixing, we propose four shaped color mixing bars tied up with the LGP and check the optical characteristics of the LGP with them by simulation. Consequently, we could know the optical conditions of improving optical efficiency and optical uniformity in the LGP through the optical design. Also we confirmed that the issues of the hot spot and non-uniform color mixing in edge type LED could be solved by using the ${\bigwedge}$-shaped window color mixing bar.

Luminescence Properties of Phosphor Layer with Discharge Conditions in AC PDP (교류형 플라즈마 디스플레이 패널의 방전 조건변화에 따른 형광막의 발광특성)

  • Jang, Sang-Hun;Tae, Heung-Sik;Choe, Gyeong-Cheol
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.10
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    • pp.704-709
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    • 1999
  • The optical properties such as luminance and color coordinates for phosphor layer were studied with applied voltage and gas pressure, Xe mixing ratio, frequency using He and Xe mixing gas in chamber like AC PDP. The luminance of red phosphor layer at constant pressure(300Toor) is increased with increasing voltage, but color purity is not varied. The luminance of red phosphor layer at constant voltage(280V)is decreased with increasing pressure, but the color purity is not varied. But the luminance is increased with increasing Xe mixing ratio at constant pressure(200Toor). And also the color purity is improved by this process. The luminance is increased up to 40kHz, but the color purity with frequency is not varied.

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Color Temperature Control of LED Floodlight Using RGB Light Color Mixing Theory

  • Kim, Gi-Hoon;Song, Sang-Bin;Cheon, Woo-Young;Kim, Jin-Hong
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.85-88
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    • 2007
  • A number of R, G and B LEDs for reference color temperature mixing ratio of RGB was determined by the theory of RGB mixing as a baseline. Once the number of LEDs was determined the objective color temperature from baseline has been achieved by the control the RGB duty ratio. And a practical prototype of 50W floodlighting adjusted by the above algorithm. The micro controller was developed with control algorithm for RGB duty ratio to obtain the objective color temperature. Detailed experiments to optimize algorithm of duty ratio and color temperature will be discussed in this paper as well.

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